It's not super saturated. It's under pressure. There's plenty of nucleation points already as it's dirty Lake water.
A On 3 Jan 2015 18:41, "Christoph Voelker" <[email protected]> wrote: > Dear all, > > I have no real expertise on that, but I'd like to add a word of caution: > Have you ever added some fine-grained powder to a liquid oversaturated with > a gas? You get a lot of bubbles quickly. The result could well be that the > grains trigger a spontaneous ebullition of the CO2 before it has time to > react with the olivine. That would be catastrophic, so even if the chance > is very low I'd rather be cautious. > > Best regards, Christoph > > On 1/3/15 2:22 PM, Schuiling, R.D. (Olaf) wrote: > > Dear All, > > Andrew suggested that I should share this discussion with the group on > whether to emit the CO2 from that acid lake in Spain to the atmosphere, or > capture it as bicarbonate by adding fine-grained olivine to the lake, > while at the same time reduce its acidity, Olaf Schuiling > > > > *From:* Schuiling, R.D. (Olaf) > *Sent:* vrijdag 2 januari 2015 12:23 > *To:* [email protected] > *Subject:* emitting or capturing CO2 > > > > Dear Andrew > > Just a few additional data on olivine use instead of degassing. I have no > money to carry out full-scale field experiments, so I am limited to the > following. > > 1. There is an olivine mine (the PASEK mine) in NW Spain, close to > the sea, with a harbor for small (up to 8.000 tons) freighters. They have > no clients for their finest fraction, which would be excellent for the acid > lake, so they have to store it back in their own mine (slight negative > value!) > > 2. The acid lake is not easy to reach, but the river Guadalquivir > (navigable to Sevilla) makes it possible to bring that olivine cheaply by > ship not too far from the acid lake. > > 3. I have done experiments with a well-known table water (Spa red), > bottled under CO2 pressure. Its starting pH was 3.9. After passing through > a tube filled with medium sized olivine grains (a passage that took > somewhere between 15 and 30 minutes), the pH had risen to 8.2! > > 4. When the lake is neutralized this way, the reaction will also > release some silica in solution. This will attract siliceous algae > (diatoms), a favorite fish food, so the lake may become a favorite spot for > fishing after treatment, and it will also have become suitable for > irrigation in dry summers. > > 5. I attach a paper describing the experiment of converting a CO2 > rich table water into a healthy magnesium bicarbonate mineral water. > (Schuiling, R.D., Hogesteger, A.W. and Praagman, E.(2011) From Spa to > Corinth, a road to CO2 sequestration) > > > > I think we should use any way to reduce CO2 emissions, so capturing CO2 > instead of freely emitting it should normally be preferred, Olaf Schuiling > > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > > > > -- > Christoph Voelker > Alfred Wegener Institute for Polar and Marine Research > Am Handelshafen 12 > 27570 Bremerhaven, Germany > e: [email protected] > t: +49 471 4831 1848 > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
